My tour of indie space strategy games has most recently stopped at Final Theory. It's literally Risk in space, but instead of dice rolls when your fleets meet, it turns into a hex-grid turn-based tactics battle. Ship models are nice and chonky, and there are basic line-of-sight rules.
This isn't a trailer, but I think it's a great explanation of the game:
Note that despite my recommendation, it isn't DRM-free. I'm just putting up with Steam for this game's sake because it is exactly what I wanted at this point in time.